Acculturation is the process through which an individual's cultural behaviors and values change via contact with a majority or host culture. Although some individuals accomplish acculturation smoothly, most experience psychological stress during the acculturation process. When psychologists encounter individuals struggling to acculturate, they are mandated by ethical guidelines and principles to help through several steps: (a) recognize their own biases, beliefs, and attitudes that may influence their work with the acculturating individual; (b) develop competence to work with individuals whose cultural beliefs and practices differ from their own; (c) counsel the acculturating individual using scientifically supported techniques; and (d) intervene without discrimination or disrespect. Two case studies are presented to illustrate how psychologists can ethically and effectively encourage mentally healthy acculturation. Copyright © 2005, Lawrence Erlbaum Associates, Inc.